/*
 * $Id$
 *
 * Copyright 2009 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
package org.jdesktop.swingx.plaf.nimbus;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.Paint;
import java.awt.RenderingHints;

import javax.swing.JComponent;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.FontUIResource;

import org.jdesktop.swingx.JXTaskPane;
import org.jdesktop.swingx.plaf.basic.BasicTaskPaneUI;

/**
 * Nimbus implementation of the <code>JXTaskPane</code> UI. <br>
 * 
 * @author <a href="mailto:Radu.Dumitrescu@pss.ro">Radu Dumitrescu</a>
 */
public class NimbusTaskPaneUI extends BasicTaskPaneUI {

	public static ComponentUI createUI(JComponent c) {
		return new NimbusTaskPaneUI();
	}

	@Override
	protected Border createPaneBorder() {
		return new NimbusPaneBorder();
	}

	/**
	 * Overriden to paint the background of the component but keeping the
	 * rounded corners.
	 */
	@Override
	public void update(Graphics g, JComponent c) {
		if (c.isOpaque()) {
			g.setColor(c.getParent().getBackground());
			g.fillRect(0, 0, c.getWidth(), c.getHeight());
			g.setColor(c.getBackground());
			g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
		}
		paint(g, c);
	}

	/**
	 * The border of the task pane group paints the "text", the "icon", the
	 * "expanded" status and the "special" type.
	 * 
	 */
	class NimbusPaneBorder extends PaneBorder {

		@Override
		protected void paintTitleBackground(JXTaskPane group, Graphics g) {

			Paint oldPaint = ((Graphics2D) g).getPaint();

			roundHeight = 7;

			if (group.isSpecial()) {
				g.setColor(specialTitleBackground);

				g.fillRoundRect(0, 0, group.getWidth(), getRoundHeight() * 2, getRoundHeight(), getRoundHeight());
				g.fillRect(0, getRoundHeight(), group.getWidth(), getTitleHeight(group) - getRoundHeight());

			} else {
				Color[] colors = { titleBackgroundGradientStart, titleBackgroundGradientEnd };

				float[] fractions = { 0.0f, 1.0f };

				LinearGradientPaint gradient = new LinearGradientPaint(group.getWidth() / 2, 0.0f, group.getWidth() / 2,
						getTitleHeight(group), fractions, colors);

				((Graphics2D) g).setPaint(gradient);

				((Graphics2D) g)
						.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
				((Graphics2D) g)
						.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
				((Graphics2D) g).setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
				((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

				g.fillRoundRect(0, 0, group.getWidth(), getTitleHeight(group) / 2, getRoundHeight(), getRoundHeight());

				g.fillRect(0, getRoundHeight(), group.getWidth(), getTitleHeight(group) - getRoundHeight());

			}

			// draw the border around the title area
			g.setColor(borderColor);

			g.drawRoundRect(0, 0, group.getWidth() - 1, getTitleHeight(group) + getRoundHeight(), getRoundHeight(),
					getRoundHeight());
			g.drawLine(0, getTitleHeight(group) - 1, group.getWidth(), getTitleHeight(group) - 1);

			((Graphics2D) g).setPaint(oldPaint);
		}

		@Override
		protected void paintExpandedControls(JXTaskPane group, Graphics g, int x, int y, int width, int height) {
			((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

			g.setColor(getPaintColor(group));
			paintChevronControls(group, g, x, y, width, height);

			((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
		}

		@Override
		protected void paintTitle(JXTaskPane group, Graphics g, Color textColor, int x, int y, int width, int height) {
			configureLabel(group);
			// Nimbus has some issues with ColorUIResource
			label.setForeground(new Color(textColor.getRGB()));
			if (group.getFont() != null && !(group.getFont() instanceof FontUIResource)) {
				label.setFont(group.getFont());
			}
			g.translate(x, y);
			label.setBounds(0, 0, width, height);
			label.paint(g);
			g.translate(-x, -y);
		}

		@Override
		protected boolean isMouseOverBorder() {
			return true;
		}
	}

}
